9.1.2. PNP Transistor Comparison

Try these first

1. 1.

   What are the two types of current in a PNP transistor?

   Hint

   Think about how current enters and exits the transistor.

2. 2.

   What condition must be fulfilled for the base-emitter junction of a PNP transistor?

   Hint

   Reverse this if thinking about NPN!

3. 3.

   In a PNP transistor, the collector current flows:

   • Into the transistor
   • Out of the transistor
   • Neither

   Hint

   Refer to how currents flow in PNP versus NPN.

4. 4.

   True or False: In forward bias, the base voltage of a PNP transistor is higher than the emitter voltage.

   • True
   • False

   Hint

   Think about how we define forward bias.

5. 5.

   Given a PNP transistor configuration with V_E = 10V, V_B = 9.3V, and V_C = -1V. Calculate the emitter current (I_E) if the base current (I_B) is 50 µA.

   Hint

   Use Kirchhoff’s law to sum the currents.

6. 6.

   If a PNP transistor has a β of 150 and the collector current is 3 mA, what is the base current?

   Hint

   Remember β represents the current gain.